/*
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package clasesmath;

/**
 *
 * @author Mizael
 */
public class Main_1 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
    
    double ac=90;
        System.out.println(Math.acos(0.39));
        // acos regresa el arco coseno del valor
    }


}
